package com.zwf.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.zwf.constant.MessageConstant;
import com.zwf.dto.UserLoginDTO;
import com.zwf.entity.User;
import com.zwf.exception.LoginFailedException;
import com.zwf.mapper.UserMapper;
import com.zwf.properties.WeChatProperties;
import com.zwf.service.UserService;
import com.zwf.utils.HttpClientUtil;
import io.swagger.v3.oas.annotations.parameters.RequestBody;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * @Author zwf
 * @date 2024/2/5 23:07
 */
@Service
public class UserServiceImpl implements UserService {

    private static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    WeChatProperties weChatProperties;

    @Autowired
    UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        //调用微信接口服务，获得当前微信用户的openid
        String openId = getOpenId(userLoginDTO.getCode());

        //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if(openId==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否为新用户，如果是新用户，自动完成注册
        User user=userMapper.queryByOpenId(openId);
        if(user==null){
            user=User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.add(user);
        }

        //返回这个用户对象
        return user;
    }
    //调用微信接口服务，获得当前微信用户的openid
    private String getOpenId(String code){
        Map<String,String> map=new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN,map);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
